Core Java Interview Questions, Answers for Freshers and Experienced asked in various Company Job Interviews

Core Java Interview Questions

Questions Answers Views Company eMail

How can you make sure that your singleton class will always return single instance in multi-threaded environment?

1090

Difference between static synchronization vs. Instance synchronization?

1180

Explain numeric promotion?

1166

What is contract between hashcode and equal method?

1107

If you do not want your class to be inherited by any other class. What would you do?

1077

What is java’s garbage collected heap?

1038

What is re-factoring in software?

1110

What is static synchronization?

1169

What is annotation in java?

1121

What are static methods?

1108

What is a map? What are the implementations of map?

1154

Which package is imported by default?

1136

What are the restrictions imposed on method overriding?

1069

What is hash code collision?

1111

What do you mean by order of precedence and associativity?

999

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Un-Answered Questions { Core Java }

Why deletion in linkedlist is fast than arraylist?

1156

What is void keyword?

1162

What is type inference in java8?

1108

What is method overloading and method overriding?

1113

What do you mean by global variable?

1003

How many threads does a core java have?

1131

List down the methods and interfaces of collection class in java.

1042

What is boolean in java?

1034

What is a local class in java?

1094

Which package is used for pattern matching with regular expressions?

1161

How hashmap works in java?

1096

What is method reference in java?

1203

Can java arraylist hold different types?

1160

How to sort elements in a parallel array in java?

953

What is the statements?

1150

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